Mini USBs are more fragile and in fact they wear out faster. Thats exactly why micro USB was designed, and why most new devices use that over mini. The micro fixes a bug in the design that causes the mini to wear out.

Mini-USB is harder to find these days, Amazon has plenty of braided Micro-USB on the other hand. USB-C would have been nice, but it doesn't really provide a big benefit over Micro-USB when it comes to keyboards.